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What is the voltage reading on the positive battery terminal clamp...not the battery post, but the clamp, when you crank the car over? And, then on the actual post, not the clamp...when cranking?

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I measured the voltage reading on the positive battery terminal clamp while cranking as requested, it was approximately 10.9 volts.

I cannot measure it at the post while cranking because I am by myself and cannot figure out a way to rig something to just touch the post and nothing else without holding it.

I also measured it at the positive clamp at rest and it was about 12.8 volts.

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I have the same problem all the time Need one or two more hands...

Okay, that is not nearly as much drop as we see at the coil or module as I recall.

So let's see what we have on the ground side.

Can you connect the probe to a good engine ground while keeping the positive probe on the Positive clamp and check the voltage while cranking?

Then do the same but put the ground probe on a body ground (not the same place as the ground cable is connected)